摘要
通过有机地化研究表明,逆冲推覆体及其前缘带有下寒武统黑灰色页岩、二叠系深灰色生物灰岩及黑灰色页岩、中三叠统雷口坡组白云岩,上三叠统须家河组灰黑色泥岩及煤层等四套较好的生油岩系。本区储集层以低渗低孔为特征,构造破坏强烈,油气保存条件较差,但在前缘带受力弱、保存完整的构造上,仍是寻找构造油气藏或岩性——构造油气藏的最有利地区,如天井山背斜东南翼的断层下盘及枫顺场突起背斜。
It has been shown through organic geochemical study that there exist four oil-generating strata: lower Cambrian black grey shales, Permian dark grey organic limestones and black grey shales, middle Triassic Leikoupo formation dolomites, and Upper Triassic Xujiahe formation grey black mudstones and coal beds in the overthrust nappe and its leading edge. Reservoirs in the area are characterized by low porosity, low permeability, intensive structural damage and poor oil-preserving conditions, but they are still favourable for finding structural or lithostructural oil and gas pools in weakly pressed, completely preserved structures in the frontal zone, such as the downblock of the south-eastern flank of Tianjinshan anticline, Fengshunchang protruding anticline.
出处
《西南石油学院学报》
CSCD
1990年第3期71-82,共12页
Journal of Southwest Petroleum Institute
关键词
逆冲推覆体
前缘带
含油性
Overthrust nappe
Frontal zone
Oil-generating strata
Oilbearing prospects
